"Continued weakness in the sales tax is particularly conspicuous since the national economy is improving and consumer confidence is growing," she said.

Sales tax revenue fell 7.3 percent from the previous April. Corporate income tax collections fell 89.7 percent in April but have increased 2.8 percent year to date.

The state's Road Fund, which relies primarily on gas and other transportation taxes, had one of its best months to date. Revenues were up 18 percent in April compared with April 2011. The state collected $143.1 million for the Road Fund in April, the most ever collected in a single month.